Switch to `ioft/i386-ubuntu:14.04` image for 32bit testing
Switch to `ioft/i386-ubuntu:14.04` image for 32bit testing

The `32bit/ubuntu:14.04` image seems to have been pulled by the owner. A
very recent commit to their repository recommends switching to
`ioft/i386-ubuntu:14.04` as the new 'official' image.

runner-mei/influxdb,nooproblem/influxdb,jgeiger/influxdb,linearb/influxdb,otoolep/influxdb,archsaber/influxdb,joaopedrotaveira/influxdb,nooproblem/influxdb,joaopedrotaveira/influxdb,nooproblem/influxdb,influxdb/influxdb,li-ang/influxdb,vladlopes/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,influxdb/influxdb,influxdb/influxdb,influxdb/influxdb,archsaber/influxdb,jgeiger/influxdb,mnuessler/influxdb,jgeiger/influxdb,influxdb/influxdb,influxdata/influxdb,runner-mei/influxdb,benbjohnson/influxdb,vladlopes/influxdb,otoolep/influxdb,mark-rushakoff/influxdb,chenziliang/influxdb,joaopedrotaveira/influxdb,benbjohnson/influxdb,chenziliang/influxdb,runner-mei/influxdb,mnuessler/influxdb,pkittenis/influxdb,runner-mei/influxdb,mark-rushakoff/influxdb,linearb/influxdb,pkittenis/influxdb,pkittenis/influxdb,pkittenis/influxdb,vladlopes/influxdb,joaopedrotaveira/influxdb,chenziliang/influxdb,mnuessler/influxdb,otoolep/influxdb,joaopedrotaveira/influxdb,pkittenis/influxdb,mnuessler/influxdb,linearb/influxdb,otoolep/influxdb,mark-rushakoff/influxdb,jgeiger/influxdb,benbjohnson/influxdb,archsaber/influxdb,mark-rushakoff/influxdb,linearb/influxdb,chenziliang/influxdb,jgeiger/influxdb,otoolep/influxdb,influxdb/influxdb,benbjohnson/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,mnuessler/influxdb,pkittenis/influxdb,mnuessler/influxdb,li-ang/influxdb,linearb/influxdb,otoolep/influxdb,vladlopes/influxdb,jgeiger/influxdb,influxdata/influxdb,archsaber/influxdb